//// Copyright (C) 2004-2021 Artifex Software, Inc.
////
//// This file is part of MuPDF.
////
//// MuPDF is free software: you can redistribute it and/or modify it under the
//// terms of the GNU Affero General Public License as published by the Free
//// Software Foundation, either version 3 of the License, or (at your option)
//// any later version.
////
//// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
//// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
//// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
//// details.
////
//// You should have received a copy of the GNU Affero General Public License
//// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
////
//// Alternative licensing terms are available from the licensor.
//// For commercial licensing, see <https://www.artifex.com/> or contact
//// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
//// CA 94129, USA, for further information.
//
//#include "mupdf/fitz.h"
//
//#include <assert.h>
//#include <string.h>
//#include <limits.h>
//
//#ifdef OCR_DISABLED
//
///* In non-OCR builds, we need to define this otherwise SWIG Python gets SEGV
//when it attempts to import mupdf.py and _mupdf.py. */
//const char *fz_pdfocr_write_options_usage = "";
//
//#else
//
//#include "tessocr.h"
//
//const char *fz_pdfocr_write_options_usage =
//	"PDFOCR output options:\n"
//	"\tcompression=none: No compression (default)\n"
//	"\tcompression=flate: Flate compression\n"
//	"\tstrip-height=N: Strip height (default 0=fullpage)\n"
//	"\tocr-language=<lang>: OCR language (default=eng)\n"
//	"\tocr-datadir=<datadir>: OCR data path (default=rely on TESSDATA_PREFIX)\n"
//	"\n";
//
//static const char funky_font[] =
//"3 0 obj\n<</BaseFont/GlyphLessFont/DescendantFonts[4 0 R]"
//"/Encoding/Identity-H/Subtype/Type0/ToUnicode 6 0 R/Type/Font"
//">>\nendobj\n";
//
//static const char funky_font2[] =
//"4 0 obj\n"
//"<</BaseFont/GlyphLessFont/CIDToGIDMap 5 0 R"
//"/CIDSystemInfo<</Ordering (Identity)/Registry (Adobe)/Supplement 0>>"
//"/FontDescriptor 7 0 R/Subtype/CIDFontType2/Type/Font/DW 500>>"
//"\nendobj\n";
//
//static const char funky_font3[] =
//"5 0 obj\n<</Length 210/Filter/FlateDecode>>\nstream\n"
//"\x78\x9c\xec\xc2\x01\x09\x00\x00\x00\x02\xa0\xfa\x7f\xba\x21\x89"
//"\xa6\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x80\x7b\x03\x00\x00\xff\xff\xec\xc2\x01\x0d\x00\x00\x00\xc2\x20"
//"\xdf\xbf\xb4\x45\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\xeb\x00\x00\x00\xff\xff\xec\xc2\x01\x0d\x00"
//"\x00\x00\xc2\x20\xdf\xbf\xb4\x45\x18\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\xeb\x00\x00\x00\xff\xff\xed"
//"\xc2\x01\x0d\x00\x00\x00\xc2\x20\xdf\xbf\xb4\x45\x18\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xeb\x00\xff"
//"\x00\x10"
//"\nendstream\nendobj\n";
//
//static const char funky_font4[] =
//"6 0 obj\n<</Length 353>>\nstream\n"
//"/CIDInit /ProcSet findresource begin\n"
//"12 dict begin\n"
//"begincmap\n"
//"/CIDSystemInfo\n"
//"<<\n"
//"  /Registry (Adobe)\n"
//"  /Ordering (UCS)\n"
//"  /Supplement 0\n"
//">> def\n"
//"/CMapName /Adobe-Identity-UCS def\n"
//"/CMapType 2 def\n"
//"1 begincodespacerange\n"
//"<0000> <FFFF>\n"
//"endcodespacerange\n"
//"1 beginbfrange\n"
//"<0000> <FFFF> <0000>\n"
//"endbfrange\n"
//"endcmap\n"
//"CMapName currentdict /CMap defineresource pop\n"
//"end\n"
//"end\n"
//"endstream\n"
//"endobj\n";
//
//static const char funky_font5[] =
//"7 0 obj\n"
//"<</Ascent 1000/CapHeight 1000/Descent -1/Flags 5"
//"/FontBBox[0 0 500 1000]/FontFile2 8 0 R/FontName/GlyphLessFont"
//"/ItalicAngle 0/StemV 80/Type/FontDescriptor>>\nendobj\n";
//
//static const char funky_font6[] =
//"8 0 obj\n<</Length 572/Length1 572>>\nstream\n"
//"\x00\x01\x00\x00\x00\x0a\x00\x80\x00\x03\x00\x20\x4f\x53\x2f\x32"
//"\x56\xde\xc8\x94\x00\x00\x01\x28\x00\x00\x00\x60\x63\x6d\x61\x70"
//"\x00\x0a\x00\x34\x00\x00\x01\x90\x00\x00\x00\x1e\x67\x6c\x79\x66"
//"\x15\x22\x41\x24\x00\x00\x01\xb8\x00\x00\x00\x18\x68\x65\x61\x64"
//"\x0b\x78\xf1\x65\x00\x00\x00\xac\x00\x00\x00\x36\x68\x68\x65\x61"
//"\x0c\x02\x04\x02\x00\x00\x00\xe4\x00\x00\x00\x24\x68\x6d\x74\x78"
//"\x04\x00\x00\x00\x00\x00\x01\x88\x00\x00\x00\x08\x6c\x6f\x63\x61"
//"\x00\x0c\x00\x00\x00\x00\x01\xb0\x00\x00\x00\x06\x6d\x61\x78\x70"
//"\x00\x04\x00\x05\x00\x00\x01\x08\x00\x00\x00\x20\x6e\x61\x6d\x65"
//"\xf2\xeb\x16\xda\x00\x00\x01\xd0\x00\x00\x00\x4b\x70\x6f\x73\x74"
//"\x00\x01\x00\x01\x00\x00\x02\x1c\x00\x00\x00\x20\x00\x01\x00\x00"
//"\x00\x01\x00\x00\xb0\x94\x71\x10\x5f\x0f\x3c\xf5\x04\x07\x08\x00"
//"\x00\x00\x00\x00\xcf\x9a\xfc\x6e\x00\x00\x00\x00\xd4\xc3\xa7\xf2"
//"\x00\x00\x00\x00\x04\x00\x08\x00\x00\x00\x00\x10\x00\x02\x00\x00"
//"\x00\x00\x00\x00\x00\x01\x00\x00\x08\x00\xff\xff\x00\x00\x04\x00"
//"\x00\x00\x00\x00\x04\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x02\x00\x01\x00\x00\x00\x02\x00\x04"
//"\x00\x01\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x01\x90\x00\x05"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x05\x00\x01\x00\x01\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x47\x4f\x4f\x47\x00\x40\x00\x00\x00\x00\x00\x01\xff\xff"
//"\x00\x00\x00\x01\x00\x01\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00"
//"\x00\x00\x00\x02\x00\x01\x00\x00\x00\x00\x00\x14\x00\x03\x00\x00"
//"\x00\x00\x00\x14\x00\x06\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x0c\x00\x00\x00\x01\x00\x00\x00\x00\x04\x00"
//"\x08\x00\x00\x03\x00\x00\x31\x21\x11\x21\x04\x00\xfc\x00\x08\x00"
//"\x00\x00\x00\x03\x00\x2a\x00\x00\x00\x03\x00\x00\x00\x05\x00\x16"
//"\x00\x00\x00\x01\x00\x00\x00\x00\x00\x05\x00\x0b\x00\x16\x00\x03"
//"\x00\x01\x04\x09\x00\x05\x00\x16\x00\x00\x00\x56\x00\x65\x00\x72"
//"\x00\x73\x00\x69\x00\x6f\x00\x6e\x00\x20\x00\x31\x00\x2e\x00\x30"
//"\x56\x65\x72\x73\x69\x6f\x6e\x20\x31\x2e\x30\x00\x00\x01\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00"
//"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
//"\nendstream\nendobj\n";
//
//#endif
//
//fz_pdfocr_options *
//fz_parse_pdfocr_options(fz_context *ctx, fz_pdfocr_options *opts, const char *args)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	const char *val;
//
//	memset(opts, 0, sizeof *opts);
//
//	if (fz_has_option(ctx, args, "compression", &val))
//	{
//		if (fz_option_eq(val, "none"))
//			opts->compress = 0;
//		else if (fz_option_eq(val, "flate"))
//			opts->compress = 1;
//		else
//			fz_throw(ctx, FZ_ERROR_ARGUMENT, "Unsupported PDFOCR compression %s (none, or flate only)", val);
//	}
//	if (fz_has_option(ctx, args, "strip-height", &val))
//	{
//		int i = fz_atoi(val);
//		if (i <= 0)
//			fz_throw(ctx, FZ_ERROR_ARGUMENT, "Unsupported PDFOCR strip height %d (suggest 0)", i);
//		opts->strip_height = i;
//	}
//	if (fz_has_option(ctx, args, "ocr-language", &val))
//	{
//		fz_copy_option(ctx, val, opts->language, nelem(opts->language));
//	}
//	if (fz_has_option(ctx, args, "ocr-datadir", &val))
//	{
//		fz_copy_option(ctx, val, opts->datadir, nelem(opts->datadir));
//	}
//
//	return opts;
//#endif
//}
//
//void
//fz_write_pixmap_as_pdfocr(fz_context *ctx, fz_output *out, const fz_pixmap *pixmap, const fz_pdfocr_options *pdfocr)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	fz_band_writer *writer;
//
//	if (!pixmap || !out)
//		return;
//
//	writer = fz_new_pdfocr_band_writer(ctx, out, pdfocr);
//	fz_try(ctx)
//	{
//		fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, pixmap->xres, pixmap->yres, 0, pixmap->colorspace, pixmap->seps);
//		fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
//		fz_close_band_writer(ctx, writer);
//	}
//	fz_always(ctx)
//		fz_drop_band_writer(ctx, writer);
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//#endif
//}
//
//#ifndef OCR_DISABLED
//typedef struct pdfocr_band_writer_s
//{
//	fz_band_writer super;
//	fz_pdfocr_options options;
//
//	int obj_num;
//	int xref_max;
//	int64_t *xref;
//	int pages;
//	int page_max;
//	int *page_obj;
//	unsigned char *stripbuf;
//	unsigned char *compbuf;
//	size_t complen;
//
//	void *tessapi;
//	fz_pixmap *ocrbitmap;
//
//	fz_pdfocr_progress_fn *progress;
//	void *progress_arg;
//} pdfocr_band_writer;
//
//static int
//new_obj(fz_context *ctx, pdfocr_band_writer *writer)
//{
//	int64_t pos = fz_tell_output(ctx, writer->super.out);
//
//	if (writer->obj_num >= writer->xref_max)
//	{
//		int new_max = writer->xref_max * 2;
//		if (new_max < writer->obj_num + 8)
//			new_max = writer->obj_num + 8;
//		writer->xref = fz_realloc_array(ctx, writer->xref, new_max, int64_t);
//		writer->xref_max = new_max;
//	}
//
//	writer->xref[writer->obj_num] = pos;
//
//	return writer->obj_num++;
//}
//
//static void
//pdfocr_write_header(fz_context *ctx, fz_band_writer *writer_, fz_colorspace *cs)
//{
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	fz_output *out = writer->super.out;
//	int w = writer->super.w;
//	int h = writer->super.h;
//	int n = writer->super.n;
//	int s = writer->super.s;
//	int a = writer->super.alpha;
//	int xres = writer->super.xres;
//	int yres = writer->super.yres;
//	int sh = writer->options.strip_height;
//	int strips;
//	int i;
//
//	if (sh == 0)
//		sh = h;
//	assert(sh != 0 && "pdfocr_write_header() should not be given zero height input.");
//	strips = (h + sh-1)/sh;
//
//	if (a != 0)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PDFOCR cannot write alpha channel");
//	if (s != 0)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PDFOCR cannot write spot colors");
//	if (n != 3 && n != 1)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PDFOCR expected to be Grayscale or RGB");
//
//	fz_free(ctx, writer->stripbuf);
//	writer->stripbuf = NULL;
//	fz_free(ctx, writer->compbuf);
//	writer->compbuf = NULL;
//	fz_drop_pixmap(ctx, writer->ocrbitmap);
//	writer->ocrbitmap = NULL;
//	writer->stripbuf = Memento_label(fz_malloc(ctx, (size_t)w * sh * n), "pdfocr_stripbuf");
//	writer->complen = fz_deflate_bound(ctx, (size_t)w * sh * n);
//	writer->compbuf = Memento_label(fz_malloc(ctx, writer->complen), "pdfocr_compbuf");
//	/* Always round the width of ocrbitmap up to a multiple of 4. */
//	writer->ocrbitmap = fz_new_pixmap(ctx, NULL, (w+3)&~3, h, NULL, 0);
//	fz_set_pixmap_resolution(ctx, writer->ocrbitmap, xres, yres);
//
//	/* Send the file header on the first page */
//	if (writer->pages == 0)
//	{
//		fz_write_string(ctx, out, "%PDF-1.4\n%PDFOCR-1.0\n");
//
//		if (writer->xref_max < 9)
//		{
//			int new_max = 9;
//			writer->xref = fz_realloc_array(ctx, writer->xref, new_max, int64_t);
//			writer->xref_max = new_max;
//		}
//		writer->xref[3] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font,  sizeof(funky_font)-1);
//		writer->xref[4] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font2, sizeof(funky_font2)-1);
//		writer->xref[5] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font3, sizeof(funky_font3)-1);
//		writer->xref[6] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font4, sizeof(funky_font4)-1);
//		writer->xref[7] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font5, sizeof(funky_font5)-1);
//		writer->xref[8] = fz_tell_output(ctx, out);
//		fz_write_data(ctx, out, funky_font6, sizeof(funky_font6)-1);
//	}
//
//	if (writer->page_max <= writer->pages)
//	{
//		int new_max = writer->page_max * 2;
//		if (new_max == 0)
//			new_max = writer->pages + 8;
//		writer->page_obj = fz_realloc_array(ctx, writer->page_obj, new_max, int);
//		writer->page_max = new_max;
//	}
//	writer->page_obj[writer->pages] = writer->obj_num;
//	writer->pages++;
//
//	/* Send the Page Object */
//	fz_write_printf(ctx, out, "%d 0 obj\n<</Type/Page/Parent 2 0 R/Resources<</XObject<<", new_obj(ctx, writer));
//	for (i = 0; i < strips; i++)
//		fz_write_printf(ctx, out, "/I%d %d 0 R", i, writer->obj_num + i);
//	fz_write_printf(ctx, out, ">>/Font<</F0 3 0 R>>>>/MediaBox[0 0 %g %g]/Contents %d 0 R>>\nendobj\n",
//		w * 72.0f / xres, h * 72.0f / yres, writer->obj_num + strips);
//}
//
//static void
//flush_strip(fz_context *ctx, pdfocr_band_writer *writer, int fill)
//{
//	unsigned char *data = writer->stripbuf;
//	fz_output *out = writer->super.out;
//	int w = writer->super.w;
//	int n = writer->super.n;
//	size_t len = (size_t)w*n*fill;
//
//	/* Buffer is full, compress it and write it. */
//	if (writer->options.compress)
//	{
//		size_t destLen = writer->complen;
//		fz_deflate(ctx, writer->compbuf, &destLen, data, len, FZ_DEFLATE_DEFAULT);
//		len = destLen;
//		data = writer->compbuf;
//	}
//	fz_write_printf(ctx, out, "%d 0 obj\n<</Width %d/ColorSpace/Device%s/Height %d%s/Subtype/Image",
//		new_obj(ctx, writer), w, n == 1 ? "Gray" : "RGB", fill, writer->options.compress ? "/Filter/FlateDecode" : "");
//	fz_write_printf(ctx, out, "/Length %zd/Type/XObject/BitsPerComponent 8>>\nstream\n", len);
//	fz_write_data(ctx, out, data, len);
//	fz_write_string(ctx, out, "\nendstream\nendobj\n");
//}
//
//static void
//pdfocr_write_band(fz_context *ctx, fz_band_writer *writer_, int stride, int band_start, int band_height, const unsigned char *sp)
//{
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	fz_output *out = writer->super.out;
//	int w = writer->super.w;
//	int h = writer->super.h;
//	int n = writer->super.n;
//	int sh = writer->options.strip_height;
//	int line;
//	unsigned char *d = writer->ocrbitmap->samples;
//
//	if (!out)
//		return;
//
//	if (sh == 0)
//		sh = h;
//
//	for (line = 0; line < band_height; line++)
//	{
//		int dstline = (band_start+line) % sh;
//		memcpy(writer->stripbuf + (size_t)w*n*dstline,
//			   sp + (size_t)line * w * n,
//			   (size_t)w * n);
//		if (dstline+1 == sh)
//			flush_strip(ctx, writer, dstline+1);
//	}
//
//	if (band_start + band_height == h && h % sh != 0)
//		flush_strip(ctx, writer, h % sh);
//
//	/* Copy strip to ocrbitmap, converting if required. */
//	d += band_start*w;
//	if (n == 1)
//	{
//		int y;
//		for (y = band_height; y > 0; y--)
//		{
//			memcpy(d, sp, w);
//			if (writer->ocrbitmap->w - w)
//				memset(d + w, 0, writer->ocrbitmap->w - w);
//			d += writer->ocrbitmap->w;
//		}
//	}
//	else
//	{
//		int x, y;
//		for (y = band_height; y > 0; y--)
//		{
//			for (x = w; x > 0; x--)
//			{
//				*d++ = (sp[0] + 2*sp[1] + sp[2] + 2)>>2;
//				sp += 3;
//			}
//			for (x = writer->ocrbitmap->w - w; x > 0; x--)
//				*d++ = 0;
//		}
//	}
//}
//
//enum
//{
//	WORD_CONTAINS_L2R = 1,
//	WORD_CONTAINS_R2L = 2,
//	WORD_CONTAINS_T2B = 4,
//	WORD_CONTAINS_B2T = 8
//};
//
//typedef struct word_t
//{
//	struct word_t *next;
//	float bbox[4];
//	int dirn;
//	int len;
//	int chars[1];
//} word_t;
//
//typedef struct
//{
//	fz_buffer *buf;
//	pdfocr_band_writer *writer;
//
//	/* We collate the current word into the following fields: */
//	int word_max;
//	int word_len;
//	int *word_chars;
//	float word_bbox[4];
//	int word_dirn;
//	int word_prev_char_bbox[4];
//
//	/* When we finish a word, we try to add it to the line. If the
//	 * word fits onto the end of the existing line, great. If not,
//	 * we flush the entire line, and start a new one just with the
//	 * new word. This enables us to output a whole line at once,
//	 * which is beneficial to avoid jittering the font sizes
//	 * up/down, which looks bad when we try to select text in the
//	 * produced PDF. */
//	word_t *line;
//	word_t **line_tail;
//	float line_bbox[4];
//	int line_dirn;
//
//	float cur_size;
//	float cur_scale;
//	float tx, ty;
//} char_callback_data_t;
//
//static void
//flush_words(fz_context *ctx, char_callback_data_t *cb)
//{
//	float size;
//
//	if (cb->line == NULL)
//		return;
//
//	if ((cb->line_dirn & (WORD_CONTAINS_T2B | WORD_CONTAINS_B2T)) != 0)
//	{
//		/* Vertical line */
//	}
//	else
//	{
//		/* Horizontal line */
//		size = cb->line_bbox[3] - cb->line_bbox[1];
//
//		if (size != 0 && size != cb->cur_size)
//		{
//			fz_append_printf(ctx, cb->buf, "/F0 %g Tf\n", size);
//			cb->cur_size = size;
//		}
//		/* Guard against division by 0. This makes no difference to the
//		 * actual calculation as if size is 0, word->bbox[2] == word->bbox[0]
//		 * too. */
//		if (size == 0)
//			size = 1;
//	}
//
//	while (cb->line)
//	{
//		word_t *word = cb->line;
//		float x, y;
//		int i, len = word->len;
//		float scale;
//
//		if ((cb->line_dirn & (WORD_CONTAINS_T2B | WORD_CONTAINS_B2T)) != 0)
//		{
//			/* Contains vertical text. */
//			size = (word->bbox[3] - word->bbox[1]) / len;
//			if (size == 0)
//				size = 1;
//			if (size != cb->cur_size)
//			{
//				fz_append_printf(ctx, cb->buf, "/F0 %g Tf\n", size);
//				cb->cur_size = size;
//			}
//
//			/* Set the scale so that our glyphs fill the line bbox. */
//			scale = (cb->line_bbox[2] - cb->line_bbox[0]) / size * 200;
//			if (scale != 0)
//			{
//				float letter_height = (word->bbox[3] - word->bbox[1]) / len;
//
//				if (scale != cb->cur_scale)
//				{
//					fz_append_printf(ctx, cb->buf, "%d Tz\n", (int)scale);
//					cb->cur_scale = scale;
//				}
//
//				for (i = 0; i < len; i++)
//				{
//					x = word->bbox[0];
//					y = word->bbox[1] + letter_height * i;
//					fz_append_printf(ctx, cb->buf, "%g %g Td\n", x-cb->tx, y-cb->ty);
//					cb->tx = x;
//					cb->ty = y;
//
//					fz_append_printf(ctx, cb->buf, "<%04x>Tj\n", word->chars[i]);
//				}
//			}
//		}
//		else
//		{
//			scale = (word->bbox[2] - word->bbox[0]) / size / len * 200;
//			if (scale != 0)
//			{
//				if (scale != cb->cur_scale)
//				{
//					fz_append_printf(ctx, cb->buf, "%d Tz\n", (int)scale);
//					cb->cur_scale = scale;
//				}
//
//				if ((word->dirn & (WORD_CONTAINS_R2L | WORD_CONTAINS_L2R)) == WORD_CONTAINS_R2L)
//				{
//					/* Purely R2L text */
//					x = word->bbox[0];
//					y = cb->line_bbox[1];
//					fz_append_printf(ctx, cb->buf, "%g %g Td\n", x-cb->tx, y-cb->ty);
//					cb->tx = x;
//					cb->ty = y;
//
//					/* Tesseract has sent us R2L text in R2L order (i.e. in Logical order).
//					 * We want to output it in that same logical order, but PDF operators
//					 * all move the point as if outputting L2R. We can either reverse the
//					 * order of chars (bad, because of cut/paste) or we can perform
//					 * gymnastics with the position. We opt for the latter. */
//					fz_append_printf(ctx, cb->buf, "[");
//					for (i = 0; i < len; i++)
//					{
//						if (i == 0)
//						{
//							if (len > 1)
//								fz_append_printf(ctx, cb->buf, "%d", -500*(len-1));
//						}
//						else
//							fz_append_printf(ctx, cb->buf, "%d", 1000);
//						fz_append_printf(ctx, cb->buf, "<%04x>", word->chars[i]);
//					}
//					fz_append_printf(ctx, cb->buf, "]TJ\n");
//				}
//				else
//				{
//					/* L2R (or mixed) text */
//					x = word->bbox[0];
//					y = cb->line_bbox[1];
//					fz_append_printf(ctx, cb->buf, "%g %g Td\n", x-cb->tx, y-cb->ty);
//					cb->tx = x;
//					cb->ty = y;
//
//					fz_append_printf(ctx, cb->buf, "<");
//					for (i = 0; i < len; i++)
//						fz_append_printf(ctx, cb->buf, "%04x", word->chars[i]);
//					fz_append_printf(ctx, cb->buf, ">Tj\n");
//				}
//			}
//		}
//
//		cb->line = word->next;
//		fz_free(ctx, word);
//	}
//
//	cb->line_tail = &cb->line;
//	cb->line = NULL;
//	cb->line_dirn = 0;
//}
//
//static void
//queue_word(fz_context *ctx, char_callback_data_t *cb)
//{
//	word_t *word;
//	int line_is_v, line_is_h, word_is_v, word_is_h;
//
//	if (cb->word_len == 0)
//		return;
//
//	word = fz_malloc(ctx, sizeof(*word) + (cb->word_len-1)*sizeof(int));
//	word->next = NULL;
//	word->len = cb->word_len;
//	memcpy(word->bbox, cb->word_bbox, 4*sizeof(float));
//	memcpy(word->chars, cb->word_chars, cb->word_len * sizeof(int));
//	cb->word_len = 0;
//
//	line_is_v = !!(cb->line_dirn & (WORD_CONTAINS_B2T | WORD_CONTAINS_T2B));
//	word_is_v = !!(cb->word_dirn & (WORD_CONTAINS_B2T | WORD_CONTAINS_T2B));
//	line_is_h = !!(cb->line_dirn & (WORD_CONTAINS_L2R | WORD_CONTAINS_R2L));
//	word_is_h = !!(cb->word_dirn & (WORD_CONTAINS_L2R | WORD_CONTAINS_R2L));
//
//	word->dirn = cb->word_dirn;
//	cb->word_dirn = 0;
//
//	/* Can we put the new word onto the end of the existing line? */
//	if (cb->line != NULL &&
//		!line_is_v && !word_is_v &&
//		word->bbox[1] <= cb->line_bbox[3] &&
//		word->bbox[3] >= cb->line_bbox[1] &&
//		(word->bbox[0] >= cb->line_bbox[2] || word->bbox[2] <= cb->line_bbox[0]))
//	{
//		/* Can append (horizontal motion). */
//		if (word->bbox[0] < cb->line_bbox[0])
//			cb->line_bbox[0] = word->bbox[0];
//		if (word->bbox[1] < cb->line_bbox[1])
//			cb->line_bbox[1] = word->bbox[1];
//		if (word->bbox[2] > cb->line_bbox[2])
//			cb->line_bbox[2] = word->bbox[2];
//		if (word->bbox[3] > cb->line_bbox[3])
//			cb->line_bbox[3] = word->bbox[3];
//	}
//	else if (cb->line != NULL &&
//		!line_is_h && !word_is_h &&
//		word->bbox[0] <= cb->line_bbox[2] &&
//		word->bbox[2] >= cb->line_bbox[0] &&
//		(word->bbox[1] >= cb->line_bbox[3] || word->bbox[3] <= cb->line_bbox[1]))
//	{
//		/* Can append (vertical motion). */
//		if (!word_is_v)
//			word->dirn |= WORD_CONTAINS_T2B;
//		if (word->bbox[0] < cb->line_bbox[0])
//			cb->line_bbox[0] = word->bbox[0];
//		if (word->bbox[1] < cb->line_bbox[1])
//			cb->line_bbox[1] = word->bbox[1];
//		if (word->bbox[2] > cb->line_bbox[2])
//			cb->line_bbox[2] = word->bbox[2];
//		if (word->bbox[3] > cb->line_bbox[3])
//			cb->line_bbox[3] = word->bbox[3];
//	}
//	else
//	{
//		fz_try(ctx)
//			flush_words(ctx, cb);
//		fz_catch(ctx)
//		{
//			fz_free(ctx, word);
//			fz_rethrow(ctx);
//		}
//		memcpy(cb->line_bbox, word->bbox, 4*sizeof(float));
//	}
//
//	*cb->line_tail = word;
//	cb->line_tail = &word->next;
//	cb->line_dirn |= word->dirn;
//}
//
//static void
//char_callback(fz_context *ctx, void *arg, int unicode,
//		const char *font_name,
//		const int *line_bbox, const int *word_bbox,
//		const int *char_bbox, int pointsize)
//{
//	char_callback_data_t *cb = (char_callback_data_t *)arg;
//	pdfocr_band_writer *writer = cb->writer;
//	float bbox[4];
//
//	bbox[0] = word_bbox[0] * 72.0f / cb->writer->ocrbitmap->xres;
//	bbox[3] = (writer->ocrbitmap->h - 1 - word_bbox[1]) * 72.0f / cb->writer->ocrbitmap->yres;
//	bbox[2] = word_bbox[2] * 72.0f / cb->writer->ocrbitmap->yres;
//	bbox[1] = (writer->ocrbitmap->h - 1 - word_bbox[3]) * 72.0f / cb->writer->ocrbitmap->yres;
//
//	if (bbox[0] != cb->word_bbox[0] ||
//		bbox[1] != cb->word_bbox[1] ||
//		bbox[2] != cb->word_bbox[2] ||
//		bbox[3] != cb->word_bbox[3])
//	{
//		queue_word(ctx, cb);
//		memcpy(cb->word_bbox, bbox, 4 * sizeof(float));
//	}
//
//	if (cb->word_len == 0)
//	{
//		cb->word_dirn = 0;
//		memcpy(cb->word_prev_char_bbox, char_bbox, 4 * sizeof(int));
//	}
//	else
//	{
//		int ox = cb->word_prev_char_bbox[0] + cb->word_prev_char_bbox[2];
//		int oy = cb->word_prev_char_bbox[1] + cb->word_prev_char_bbox[3];
//		int x = char_bbox[0] + char_bbox[2] - ox;
//		int y = char_bbox[1] + char_bbox[3] - oy;
//		int ax = x < 0 ? -x : x;
//		int ay = y < 0 ? -y : y;
//		if (ax > ay)
//		{
//			if (x > 0)
//				cb->word_dirn |= WORD_CONTAINS_L2R;
//			else if (x < 0)
//				cb->word_dirn |= WORD_CONTAINS_R2L;
//		}
//		else if (ay < ax)
//		{
//			if (y > 0)
//				cb->word_dirn |= WORD_CONTAINS_T2B;
//			else if (y < 0)
//				cb->word_dirn |= WORD_CONTAINS_B2T;
//		}
//	}
//
//	if (cb->word_max == cb->word_len)
//	{
//		int newmax = cb->word_max * 2;
//		if (newmax == 0)
//			newmax = 16;
//		cb->word_chars = fz_realloc_array(ctx, cb->word_chars, newmax, int);
//		cb->word_max = newmax;
//	}
//
//	cb->word_chars[cb->word_len++] = unicode;
//}
//
//static int
//pdfocr_progress(fz_context *ctx, void *arg, int prog)
//{
//	char_callback_data_t *cb = (char_callback_data_t *)arg;
//	pdfocr_band_writer *writer = cb->writer;
//
//	if (writer->progress == NULL)
//		return 0;
//
//	return writer->progress(ctx, writer->progress_arg, writer->pages - 1, prog);
//}
//
//static void
//pdfocr_write_trailer(fz_context *ctx, fz_band_writer *writer_)
//{
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	fz_output *out = writer->super.out;
//	int w = writer->super.w;
//	int h = writer->super.h;
//	int xres = writer->super.xres;
//	int yres = writer->super.yres;
//	int sh = writer->options.strip_height;
//	int strips;
//	int i;
//	size_t len;
//	unsigned char *data;
//	fz_buffer *buf = NULL;
//	char_callback_data_t cb = { NULL };
//
//	if (sh == 0)
//		sh = h;
//	strips = (h + sh-1)/sh;
//
//	/* Send the Page contents */
//	/* We need the length to this, so write to a buffer first */
//	fz_var(buf);
//	fz_var(cb);
//	fz_try(ctx)
//	{
//		cb.writer = writer;
//		cb.buf = buf = fz_new_buffer(ctx, 0);
//		cb.line_tail = &cb.line;
//		cb.word_dirn = 0;
//		cb.line_dirn = 0;
//		fz_append_printf(ctx, buf, "q\n%g 0 0 %g 0 0 cm\n", 72.0f/xres, 72.0f/yres);
//		for (i = 0; i < strips; i++)
//		{
//			int at = h - (i+1)*sh;
//			int this_sh = sh;
//			if (at < 0)
//			{
//				this_sh += at;
//				at = 0;
//			}
//			fz_append_printf(ctx, buf, "/P <</MCID 0>> BDC\nq\n%d 0 0 %d 0 %d cm\n/I%d Do\nQ\n",
//				w, this_sh, at, i);
//		}
//
//		fz_append_printf(ctx, buf, "Q\nBT\n3 Tr\n");
//
//		ocr_recognise(ctx, writer->tessapi, writer->ocrbitmap, char_callback, pdfocr_progress, &cb);
//		queue_word(ctx, &cb);
//		flush_words(ctx, &cb);
//		fz_append_printf(ctx, buf, "ET\n");
//
//		len = fz_buffer_storage(ctx, buf, &data);
//		fz_write_printf(ctx, out, "%d 0 obj\n<</Length %zd>>\nstream\n", new_obj(ctx, writer), len);
//		fz_write_data(ctx, out, data, len);
//		fz_drop_buffer(ctx, buf);
//		buf = NULL;
//		fz_write_string(ctx, out, "\nendstream\nendobj\n");
//	}
//	fz_always(ctx)
//	{
//		fz_free(ctx, cb.word_chars);
//	}
//	fz_catch(ctx)
//	{
//		fz_drop_buffer(ctx, buf);
//		fz_rethrow(ctx);
//	}
//}
//
//static void
//pdfocr_close_band_writer(fz_context *ctx, fz_band_writer *writer_)
//{
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	fz_output *out = writer->super.out;
//	int i;
//
//	/* We actually do the trailer writing in the close */
//	if (writer->xref_max > 2)
//	{
//		int64_t t_pos;
//
//		/* Catalog */
//		writer->xref[1] = fz_tell_output(ctx, out);
//		fz_write_printf(ctx, out, "1 0 obj\n<</Type/Catalog/Pages 2 0 R>>\nendobj\n");
//
//		/* Page table */
//		writer->xref[2] = fz_tell_output(ctx, out);
//		fz_write_printf(ctx, out, "2 0 obj\n<</Count %d/Kids[", writer->pages);
//
//		for (i = 0; i < writer->pages; i++)
//		{
//			if (i > 0)
//				fz_write_byte(ctx, out, ' ');
//			fz_write_printf(ctx, out, "%d 0 R", writer->page_obj[i]);
//		}
//		fz_write_string(ctx, out, "]/Type/Pages>>\nendobj\n");
//
//		/* Xref */
//		t_pos = fz_tell_output(ctx, out);
//		fz_write_printf(ctx, out, "xref\n0 %d\n0000000000 65535 f \n", writer->obj_num);
//		for (i = 1; i < writer->obj_num; i++)
//			fz_write_printf(ctx, out, "%010ld 00000 n \n", writer->xref[i]);
//		fz_write_printf(ctx, out, "trailer\n<</Size %d/Root 1 0 R>>\nstartxref\n%ld\n%%%%EOF\n", writer->obj_num, t_pos);
//	}
//}
//
//static void
//pdfocr_drop_band_writer(fz_context *ctx, fz_band_writer *writer_)
//{
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	fz_free(ctx, writer->stripbuf);
//	fz_free(ctx, writer->compbuf);
//	fz_free(ctx, writer->page_obj);
//	fz_free(ctx, writer->xref);
//	fz_drop_pixmap(ctx, writer->ocrbitmap);
//	ocr_fin(ctx, writer->tessapi);
//}
//#endif
//
//fz_band_writer *fz_new_pdfocr_band_writer(fz_context *ctx, fz_output *out, const fz_pdfocr_options *options)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	pdfocr_band_writer *writer = fz_new_band_writer(ctx, pdfocr_band_writer, out);
//
//	writer->super.header = pdfocr_write_header;
//	writer->super.band = pdfocr_write_band;
//	writer->super.trailer = pdfocr_write_trailer;
//	writer->super.close = pdfocr_close_band_writer;
//	writer->super.drop = pdfocr_drop_band_writer;
//
//	if (options)
//		writer->options = *options;
//	else
//		memset(&writer->options, 0, sizeof(writer->options));
//
//	/* Objects:
//	 *  1 reserved for catalog
//	 *  2 for pages tree
//	 *  3 font
//	 *  4 cidfont
//	 *  5 cid to gid map
//	 *  6 tounicode
//	 *  7 font descriptor
//	 *  8 font file
//	 */
//	writer->obj_num = 9;
//
//	fz_try(ctx)
//	{
//		writer->tessapi = ocr_init(ctx, writer->options.language, writer->options.datadir);
//	}
//	fz_catch(ctx)
//	{
//		fz_drop_band_writer(ctx, &writer->super);
//		fz_throw(ctx, FZ_ERROR_LIBRARY, "OCR initialisation failed");
//	}
//
//	return &writer->super;
//#endif
//}
//
//void
//fz_pdfocr_band_writer_set_progress(fz_context *ctx, fz_band_writer *writer_, fz_pdfocr_progress_fn *progress, void *progress_arg)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	pdfocr_band_writer *writer = (pdfocr_band_writer *)writer_;
//	if (writer == NULL)
//		return;
//	if (writer->super.header != pdfocr_write_header)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "Not a pdfocr band writer!");
//
//	writer->progress = progress;
//	writer->progress_arg = progress_arg;
//#endif
//}
//
//void
//fz_save_pixmap_as_pdfocr(fz_context *ctx, fz_pixmap *pixmap, char *filename, int append, const fz_pdfocr_options *pdfocr)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	fz_output *out = fz_new_output_with_path(ctx, filename, append);
//	fz_try(ctx)
//	{
//		fz_write_pixmap_as_pdfocr(ctx, out, pixmap, pdfocr);
//		fz_close_output(ctx, out);
//	}
//	fz_always(ctx)
//		fz_drop_output(ctx, out);
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//#endif
//}
//
///* High-level document writer interface */
//
//#ifndef OCR_DISABLED
//typedef struct
//{
//	fz_document_writer super;
//	fz_draw_options draw;
//	fz_pdfocr_options pdfocr;
//	fz_pixmap *pixmap;
//	fz_band_writer *bander;
//	fz_output *out;
//	int pagenum;
//} fz_pdfocr_writer;
//
//static fz_device *
//pdfocr_begin_page(fz_context *ctx, fz_document_writer *wri_, fz_rect mediabox)
//{
//	fz_pdfocr_writer *wri = (fz_pdfocr_writer*)wri_;
//	return fz_new_draw_device_with_options(ctx, &wri->draw, mediabox, &wri->pixmap);
//}
//
//static void
//pdfocr_end_page(fz_context *ctx, fz_document_writer *wri_, fz_device *dev)
//{
//	fz_pdfocr_writer *wri = (fz_pdfocr_writer*)wri_;
//	fz_pixmap *pix = wri->pixmap;
//
//	fz_try(ctx)
//	{
//		fz_close_device(ctx, dev);
//		fz_write_header(ctx, wri->bander, pix->w, pix->h, pix->n, pix->alpha, pix->xres, pix->yres, wri->pagenum++, pix->colorspace, pix->seps);
//		fz_write_band(ctx, wri->bander, pix->stride, pix->h, pix->samples);
//	}
//	fz_always(ctx)
//	{
//		fz_drop_device(ctx, dev);
//		fz_drop_pixmap(ctx, pix);
//		wri->pixmap = NULL;
//	}
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//}
//
//static void
//pdfocr_close_writer(fz_context *ctx, fz_document_writer *wri_)
//{
//	fz_pdfocr_writer *wri = (fz_pdfocr_writer*)wri_;
//
//	fz_close_band_writer(ctx, wri->bander);
//	fz_close_output(ctx, wri->out);
//}
//
//static void
//pdfocr_drop_writer(fz_context *ctx, fz_document_writer *wri_)
//{
//	fz_pdfocr_writer *wri = (fz_pdfocr_writer*)wri_;
//
//	fz_drop_pixmap(ctx, wri->pixmap);
//	fz_drop_band_writer(ctx, wri->bander);
//	fz_drop_output(ctx, wri->out);
//}
//#endif
//
//fz_document_writer *
//fz_new_pdfocr_writer_with_output(fz_context *ctx, fz_output *out, const char *options)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	fz_pdfocr_writer *wri = NULL;
//
//	fz_var(wri);
//
//	fz_try(ctx)
//	{
//		wri = fz_new_derived_document_writer(ctx, fz_pdfocr_writer, pdfocr_begin_page, pdfocr_end_page, pdfocr_close_writer, pdfocr_drop_writer);
//		fz_parse_draw_options(ctx, &wri->draw, options);
//		fz_parse_pdfocr_options(ctx, &wri->pdfocr, options);
//		wri->out = out;
//		wri->bander = fz_new_pdfocr_band_writer(ctx, wri->out, &wri->pdfocr);
//	}
//	fz_catch(ctx)
//	{
//		fz_drop_output(ctx, out);
//		fz_free(ctx, wri);
//		fz_rethrow(ctx);
//	}
//
//	return (fz_document_writer*)wri;
//#endif
//}
//
//fz_document_writer *
//fz_new_pdfocr_writer(fz_context *ctx, const char *path, const char *options)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	fz_output *out = fz_new_output_with_path(ctx, path ? path : "out.pdfocr", 0);
//	return fz_new_pdfocr_writer_with_output(ctx, out, options);
//#endif
//}
//
//void
//fz_pdfocr_writer_set_progress(fz_context *ctx, fz_document_writer *writer, fz_pdfocr_progress_fn *progress, void *progress_arg)
//{
//#ifdef OCR_DISABLED
//	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "No OCR support in this build");
//#else
//	fz_pdfocr_writer *wri = (fz_pdfocr_writer *)writer;
//	if (!writer)
//		return;
//	if (writer->begin_page != pdfocr_begin_page)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "Not a pdfocr writer!");
//	fz_pdfocr_band_writer_set_progress(ctx, wri->bander, progress, progress_arg);
//#endif
//}
